add file browser component and widget

widgets/file_browser_widget/build.sh

@@ -0,0 +1,49 @@
+#!/bin/bash
+
+# Build script for FileBrowser Widget
+# This script creates a unified distribution in dist/ that works for both:
+# 1. NPM distribution (includes package.json, TypeScript definitions, README)
+# 2. Direct embedding (includes bundled Uppy.js dependencies)
+
+set -e
+
+echo "🔧 Building FileBrowser Widget..."
+
+# Clean previous builds
+echo "🧹 Cleaning previous builds..."
+rm -rf dist/
+
+# Build with wasm-pack directly to dist directory
+echo "📦 Building WASM package directly to dist/..."
+wasm-pack build --target web --out-dir dist --release
+
+# Download and bundle Uppy.js dependencies for self-contained use
+echo "📦 Downloading Uppy.js dependencies..."
+curl -s "https://releases.transloadit.com/uppy/v3.25.4/uppy.min.js" -o dist/uppy.min.js
+curl -s "https://releases.transloadit.com/uppy/v3.25.4/uppy.min.css" -o dist/uppy.min.css
+
+# Verify files were downloaded correctly
+if [ -s dist/uppy.min.js ] && [ -s dist/uppy.min.css ]; then
+    echo "✅ Uppy.js bundled successfully ($(wc -c < dist/uppy.min.js) bytes JS, $(wc -c < dist/uppy.min.css) bytes CSS)"
+else
+    echo "❌ Failed to download Uppy.js files"
+    exit 1
+fi
+
+echo "✅ Build complete!"
+echo ""
+echo "📦 Unified distribution created in dist/ with:"
+echo "  🔹 NPM support: package.json, TypeScript definitions, README"
+echo "  🔹 Direct embedding: bundled Uppy.js dependencies"
+echo "  🔹 Self-contained: no external dependencies required"
+echo ""
+echo "🌐 Use 'cargo run --example server' to test the widget"
+echo "📦 Use 'npm publish dist/' to publish to npm"
+echo ""
+
+echo "🎯 All widget files ready in dist/ directory:"
+echo "  - file_browser_widget.js ($(wc -c < dist/file_browser_widget.js 2>/dev/null || echo '0') bytes)"
+echo "  - file_browser_widget_bg.wasm ($(wc -c < dist/file_browser_widget_bg.wasm 2>/dev/null || echo '0') bytes)"
+echo "  - uppy.min.js ($(wc -c < dist/uppy.min.js 2>/dev/null || echo '0') bytes)"
+echo "  - uppy.min.css ($(wc -c < dist/uppy.min.css 2>/dev/null || echo '0') bytes)"
+echo "  - package.json, *.d.ts, README.md (npm metadata)"